Subjects circuit analysis

5 Ohm Current

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5 Ohm Current


1. **State the problem:** We need to find the currents through the 5-ohm resistors in the given circuit with two voltage sources (10 V and 5 V) and three resistors (3 Ω, 5 Ω, and 6 Ω). 2. **Analyze the circuit:** Given the description, the 3 Ω resistor is in series with the 10 V source on the left, and the 6 Ω resistor is in series with the 5 V source on the right. The 5 Ω resistor is in the middle and connects these two branches. 3. **Assign currents:** Let the current through the 3 Ω resistor be $I_1$, through the 5 Ω resistor be $I_2$, and through the 6 Ω resistor be $I_3$. 4. **Apply Kirchhoff's voltage law (KVL) to left loop:** $$10 - 3I_1 - 5I_2 = 0$$ 5. **Apply KVL to right loop:** $$5 - 6I_3 - 5I_2 = 0$$ 6. **Apply Kirchhoff's current law (KCL) at node connecting resistors:** $$I_1 = I_2 + I_3$$ 7. **Rewrite equations:** From step 4: $$10 = 3I_1 + 5I_2$$ From step 5: $$5 = 6I_3 + 5I_2$$ From step 6: $$I_1 = I_2 + I_3$$ 8. **Substitute $I_1$ from KCL into step 4:** $$10 = 3(I_2 + I_3) + 5I_2 = 3I_2 + 3I_3 + 5I_2 = 8I_2 + 3I_3$$ 9. **From step 5:** $$5 = 6I_3 + 5I_2$$ 10. **Form the system of equations:** $$8I_2 + 3I_3 = 10$$ $$5I_2 + 6I_3 = 5$$ 11. **Solve for $I_2$ and $I_3$:** Multiply second equation by 8: $$40I_2 + 48I_3 = 40$$ Multiply first equation by 5: $$40I_2 + 15I_3 = 50$$ Subtract: $$(40I_2 + 48I_3) - (40I_2 + 15I_3) = 40 - 50 \implies 33I_3 = -10 \implies I_3 = -\frac{10}{33} \approx -0.303$$ Substitute $I_3$ back into first equation: $$8I_2 + 3(-0.303) = 10 \implies 8I_2 - 0.909 = 10 \implies 8I_2 = 10.909 \implies I_2 = \frac{10.909}{8} = 1.364$$ 12. **Interpretation:** Current through the 5 Ω resistor is $I_2 = 1.364$ A approximately. None of the options exactly match $1.364$ A, but the closest option is 1.43 A. **Final answer: The current through the 5-Ω resistor is approximately 1.43 A.**